On Dec 18, 2015, at 4:11 PM, John McCall via swift-evolution
<swift-evolution@swift.org> wrote:
>>
>> One potentially large downside is you can no longer look at a type
>> declaration and find out how large it is. For example, I could define
>>
>> struct Foo {
>> var x: Int
>> }
>>
>> and it looks like a tiny struct, but I could then add an extension in a
>> separate file that bloats that out to some ridiculously massive struct, and
>> that wouldn't be obvious from looking at it.
>
> I think any storage-in-extensions proposal ought to be a special feature of
> classes; I would not support the ability to add stored properties to structs
> in extensions, even from within the module.
I agree.
-Chris
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